According to Death, the Leviathans were the first beasts created by God. Death describes them as "clever" and "poisonous". He also says he personally found them "entertaining". The Leviathan were known for their power and ravenous hunger and their purpose of satiating it by finding and taking sustainable food sources.

Can leviathans kill angels?

Super Strength: Leviathans are among the strongest entities in the Supernatural series. Low-tier and mid-tier leviathans can easily overpower ordinary angels, all demons (except white-eyed and Hell-Prince), all monsters except Alphas, and all deities except Cheif Deities.

What can defeat a Leviathan?

Leviathan is weak to electricity but resistant to ice and fire attacks. To take down Leviathan, stay away from non-electricity magic and elemental summons. The boss is also immune to most effects. Be careful not to spam lightning too hard, or you'll run out of MP in a fight where Cure is effectively required.